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LAFAYETTE PAGE 10-1

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LAFAYETTE RADIO MFG. CO.

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2 LAFAYETTE MODELS B30,B32 Alignment Resistances


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I, FAYE'I" I'E RAI)IO MFG. CO. lAJDELS B30,B32 Schemat ic

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Power Consumption - 140 Watts (At 115 volts 60 cycles)

Power Output 15 Watts Undistorted

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Volume Control at Maximum

Tube Function Heater

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1.AN'A1"1~:'1"l'E PAU1? 10-5

MODELS B35,B36 1,.1Fr1I'F:1"I'l+; RA 1) JIFG. CO. schematic

Power Consumption - 90 Watts (At 115 volt, 60 cycles)

Power Output 5 Watts Undistorted

Selectivity - 22 KC Broad at 1000 times Signal (Sharp)

Sept., 1935

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6 LAFAYETTE MODELS B35,B36 Voltage,Socket,Coils Trirvnors,Fiìono.Data

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VOLTAGES AT SOCKETS Line Voltage, 115 - Volume Control at Maximum

Antenna Shorted to Ground

Type of

Tube Function

Heater or

Filans't

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Ground

Screen to

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M. A.

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76 1st A. F. 6.1 265 14. 5.0

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iu. 5 --Location of Tubes Fig. 3-Location of Trimmers



LAFAYETTE PAGE 10-7


MODELS B35,B36 Alignment,Changes DC Resistances

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LAFAYETTE PAGE 10-11

LtN'r'iI'E'l'TE RAI)IC) MFG. CO. MODEL B78 Schematic

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Power Consumption 290 Watts (At 115 Volts 60 Cycles)

Power Output - - - - 30 Watts Undistorted

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12 LAFAYETTE TIODE L B78 S.P.L. Schematic

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Fig. 6-Trimmer Location

Fig. 7-Bottom View of. Metal Tube Socket

Fig. 8-Condenser Block Internal Wiring

LIDDEL B78 Voltage ,Trimmers Chassis

OSC. SECTION 2

OSC. TRACKING'. COIL L 3

INTERSTAGE PRI. SECTION I

i'RANGE INTERSTAGE PLATE REACTOR l

ANTENNA SECTION

OSC. SECTION I

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r,E-RANGE INTERSTAGE R.E TRANS. T4

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14 LAFAYETTE LtDEL B7S Tri^üners,Color Codo

Changos,Phono.

LAFAYET'l'E ItAI)IO MFG. CO.

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D. C. Resistance of Windings Refer to Figs. 12, 2 et 3. D .;;,

Part No. Winding Code in Ohm. P -9A428 Antenna R.F. Transformer Ti

Range H Printery Winding 22.8 Range C Primary Winding 0.35 Range D Primary Winding 0.2 Range B Secondary Winding 6.1 Range C Secondary Winding 1.8 Range D Secondary Winding Small

P -9A435 "E" Range Antenna R.F. Coil Ti Small P -9A429 lit Interstage R.F. Transformer T3

Range B Primary Winding Range C Primary Winding Range D Primary Winding Range B Secondary Winding Range C Secondary Winding Range D Secondary Winding

P -9A436 "E" Range Interstage R.F. Coil T4 Tap to either side

P -53X85 "B" Power Transformer (115 Volta Cycles)

60 T12

Primary Winding Secondary Winding

Center Tap to Inside 48.0 Center Tap to Outside 53.1

P50X25 Audio Input Transformer T13

P -51X33 Audio Output Transformer TI4 Primary Winding

Center Tap to Inside Center Tap to Outside

Secondary Winding P-I2A206 12" Dynamic Speaker

Speaker Voice Coil Speaker Field L7

3.7 2.5 0.5 5.8 1.8

Small

Small

Phonograph in Summate Cabinet For chu assembly, a f conductor able and a mall .al panel a...ably are applied. Thu wombly

h s the ndiophoio twitch, úp jabs for pick-up lea& and termirul plate for phono obit.

The phono panel ie mounted at the m nt place in the cabinet at which comen:iona ccan

be compiened. Thr .ouch u ºcured to tam r 000r board an illustrated in Fig. 14.

The sock. at the end of the cable u .cored to the terminal plate on the pawl and the plug at the other end of the cable ,O ironed into the phono mace on the RP. chan.

When the .with ú thrown to the radio ode. the phono pickup u excluded from the signal diode

When is l mean ro phono stile, tbe ó g al diode wt ú opened and the phonograph connections completed this draws Roter 8.13 ie own circuited. Thin brings the grid and cathode of the 76 A.V.C. amplifier to da am potential and came a plats in chu tube of mffrrmt in. tonne to brin` the R.P. and 1st I.P. tube. the point of cut off (See article on dreuit for furet in- formation regarding operation of A V.C..ymm).

1.9 Phonograph and Redis in Combindion Cabinet

Primary Winding Tap to Plate of 6F7 6600. Tap to Tone Control and Plate of 6B7 4650.

Secondary Winding Center Tap to Inside 2840. Center Tap to Outside 3260,

P -12A213 12" Dynamic Speaker Speaker Voice Coil Speaker Field L8

P -9A391 "E" Range Interstage Plate Reactor LI

P -9A450 2nd I.F. Plate Isolating Reactor L2

P -9A391 High Frequency Oscillator Tracking Coil L3

P52X35 Filter Reactor IA P -52X36 Filter Reactor L6 P -48X201 Block Condenser & 10 KC Reactor As-

sembly BI 10 KC Reactor L5

P -9A430 2nd Interstage R.F. Coils T5 Range B Section

Long Portion Short Portion

Range C Section Long Portion 1.9 Short Portion 0.2

Range D Section Small

P -9A432 Ist I.F. Transformer T6 Primary Winding Coupling Winding Secondary Winding

Tap to Condenser Side Tap to Switch Side

P -9A433 2nd I.F. Transformer T7 Primary Winding 4.4 Coupling Winding . 0.3 Secondary Winding

Tap to Condenser Side Tap to Switch Side

P -9A434 3rd I.F. Transformer T8 Primary Winding (Yellow to Blue) Signal Diode Secondary A.V.C: Seconder

1h,. ably, a number of ..parant item u Mown in the peu lis are supplied. The phono ohm circuiting plug .upplid with the receiver r mod after certain Changº have been made.

Pint take of the .hell of clos plug by twining the .hell in tither direction. The shill u thin dNk.l Nd equipped with a rubber grommet s thoron in

Pig. 13 (e). Next unsolder and remove the jumper wire from the plug ae shown in Pig. 13 (A). Ea. red the leads through the hole n the shell and alder du lods to the prong. on the plug s illustrated. Complete the connections to the .witch and tip ;ache

Mown. The .witch ú tad on the moto board and the tip poke at the naseau convenient place

The docnpton of the co o given for the separate phonograph cabinet do applka to the

ambmauon.

Alignment and Calibration Correct

with receiver..mely

important n con vers are

allcion properly aligned n the factorywish preduon in. and realignment should be anemprd

6.3 mitas all other pooble owe. of the faulty operation 4500, have 6m been investigated and mlº, the ..ovin.

Technician h.. the proper equipment.

A Signal generator that NU provide an accurately calibrated emu' at 416, 1730, 1700. 600, 5800, 1000, 16,300. 13.000, 6000, 48,000 and 40.000 KC andoutpu an

rúallytmpoiblc to align th meter are

e receiver if a

will he unaaoda

1.0 a 4 'vire n used. d.io the broil

f a nation u tuned in wit the ty cones position and this cor,.

35.0 orol is men tuned to the .harp positon, the worn may diappea The an indication that the

1.0 or alignment. n Dee a non'merafic screwdriver for Ne adjutant...

The complete procedure u ar follow.-

I. F. Adjustment 11.2 Sn the signel generator for a signal of 416 KC

Connect the output of the Signal generator to the gnd of the lu detector through a 0.1 ..f. condemn.

Cannot the ground lead of the receiver to N. 0.6 mom. pat of the signal generator.

Turn he band decor the Range B poumn (itandud wave hand -purple dial color).

Tam th` m

(.doily control the .hep position 5.6 and keep i Ni. position for an .dpmm.u. 0.2 Tu. the volume control to Ne maximum pantie.

Attenuate tam Sigrid from the signal generator to prevent Ne levelling -off action of the A.V.C.

Then djun ils ive I.P. timmm met maximum output u obtained. The adjoining mew. for than condemn as reached from the top of the rh,ria and Ih, location u ahown in Pig. 4.

Range B Alignment 1730 KC Adjustment

3.0 Sr, the Jgnil generator for 1730 KC. 1.3 Turn the mot of the tuning cord., . to seam fut

open positon.

Keep Ne band Bator in the na d,rd wave pur

Connect the antenna lad of tam reoive through a 200 mad. condmar to the output of the og.ui generator.

For th,. and .g .uhagnne eljmeente keep the volume card at the maximum positon and amount the egnal from the signal generator to prevent AV.C.

9.7

12.4 Admet the oscillator Range B trimmer (C14) until pa i. obtained. The boom of eh1.

trimmer above m (Ng. 6.

1500 KC Adiustneest

3,0 Set Ne tend generator for 1100 KC 0.8 Turn the roto of tue tuning ondnuer carefdly

und maximum output u obtained.

1.7 Loam the pointer se< and the knee po the 1300 KC mark on the mandate wave bind scak. Re-6ghr.n doe an now.

Adj.. the la and 2nd 'menage Range B tern Small mere (C17 and CI6) and antenna Range B trimmer Small (C3) to maeimr i.

0.2 Do not change the setting of the manor Range B trimmer

19.7

22.4

0.4

6.3 4500.

(Brown Secondary ( n to Green) P -9A431 Oscillator Coils T9

Range H Grid Coil Red -White tap to White Red -White tap to BlackYellow

Range C Grid Coil Green -White tap to Green Green -White tap to Black -Yellow 0.5

Range D Grid Coil Black -White tap to Black Black -White tap to Black -Yellow

Oscillator Range D Plate Coil P -9A437 "E" Range Oscillator Coils TIO

Range E Grid Coil Small Range E Plate Coil .4 Range E Series Grid Coil Small

P -53X88 Filament Transformer (115 Volts 60 Cycles) Tll Primary Winding 4.4 Filament Transformer Secondaries, below

Red to Red Small Black to Black Small Yellow to Yellow Small Green ' lo Green Small Black to White 22.8. Red -White to Red 32.9

51.6

4.4 0.3

3.0 1.3

7.0

600 KC Adjustment Set the signal generator for SRC Turn the tuning condom mol maximum

.rom i. obtained. Tan the rotor lowly back and forth at Ne mime

time djaong the 600 KC normº untd the peak .

fggreaten Moony r obtained. So Pig. 6 for lo-

f Nt tritrimmerimm

fg Be mie to use a non-metallic soe.dtiver for Ihi.

echoes...

MODEL B78 Alignment Resistances

Range C Alignment 5800 KC Adjustment

Set the signal generator foe 1800 KC. Connect the antenna lead of the receive through

a 400 ohm reactor to the output of the t of gene. ram.

Torn the rotor o( the tuning condenser to the full ON position.

Turn the band'elector to the Range C portion ( la Jun wave band --green dial mks).

Aa mentioned above, keep the volume control at the maximum position and attenuate the aigrin from the signal generator to prevent A.V.C. action.

Adjust the oscillator Range C trimmer (C16) unn put se obtained. See Pig. 6 for (ont o thú o. mº.

5000 KC AdPWm.nl Sei the signal generator for 1000 KC. Tun the rotor of the tuning condenser carefdly

until monism output u obtained. Adp,a the let and 2nd interºage Range C tnm-

m (CI6 and C19) and antenna Range C trimmer (Ca) to

Do no change the stung of the mediator Range C trimmer.

Range D Alignment 18,300 K'C Adjustment

S. the mg.ul generator for 18,300 -RC Keep the antenna led o( the rerrive connected

through the 400 ohm minor to the mom of the erg. nal generator.

Tun the rater of the tuning condenser to the full open ponton.

Turn the band akcto to the Range D po 'stun (2nd thon wave band --red dial color).

Act mentioned above, hop the volume control at Ne maximum coition Neonate on he signal free the signal generator to A.V,C action.

Adjust the ocdlhtor Range D trime. (C57) .o0 maximum output u obtained. See Pig. 6 for location o( Chu trimmer.

15,000 KC Adjustment Sr. du dgnal generator for I5,000 RC. Turn thr

rotor Othe tuning dente canfdly until m.xi mum put u obtained.

Adjust the In and 2nd internage Range D rim. men (CI1 and C20) and antenna Range D trimmer (C7) to maxim

When adjusting the 2011 intersage Range D mm- wll be »eery at the sou time to ton e

tuning condeneer rotor Jowly bark and forth nod the peak of greaten inenity te obtained.

Then go bad and repot Ne procedure is given (or the 16,300 KC adjustment If it u found &m- eaty to make any appreciable change in the sang of the o,oiWoor Range D trimmer. Ne 13.000 KC ad - tome. mort be repeated.

Do not make any further change in the getting of the odkror Range D trimmer.

6000 KC Adjushn.nf Set the signal generator for 6000 KC. Turn Ne g conden rotor un annum

output is obtained. m d m

Tun tie nor Jowly buck and forth at the aine timti djmmg the 6000 KC trìmmer'mril the peak of redeem inanity is obtained. So Pig. 6 for location

f Chu trimmer. Use a nonmetallic screwdriver for chu adjustment.

Rang. E Alignment 48,000 KC Adjustment

Set the timbal generator for 48000 KC Keep the antenna lead of the receive connected

through the 400 ohm minor to the output of the .1g -

net generator. Turn the rotor of the tuning condenser to Ne full

ON posit«. Turn he band sector the Range E position

(3rd Non wave bad-bei dial coke)..

eminnim Adjust the ) until

outpuutmu Range .

obtained. See Ng for E trimmer

Oleoebn of Chu trimmer.

40,000 KC Adjwtment Set th. zonal generator (or 40,000 KC. Turn the moro of the tuning mndenaer carefully

until w output u obtained. Adjuu'the interaage Rang.9.e trimmer (CIO and

Range E trimmer (CO)C6 to muimum. antenna not change the setting of the mediator Range

E .mean.

Switch Contacon tg 'laniard arrangement nodcotact location

numbering haa been adopted. Thee numbering is Inured in Pig. 9. In wore contact locations rent u doe number applying to that panicule bcaton ú not employed.

Twenty-five Cycle Revivers The cary' oe cycle receiver differ. from tam

aiaty cycle receiver in the fan that "pedal twenty -fin 'pack filament and "B" power ttandamen mat be used. It elm ha additional condemn in the power usa --C67 and C68 u intimated in Pig. 3. The twenty-five cycle erandmnen and the ord.,. ben are dnovn in the pane Bac

The twentySve cycle on be operand saofaetnnly trama Jazy eyrie power apply 'f The two condoms C67 and C66 are removed. How- ever. the reverse

n not true, that i. envy cycle

receiver a cann be operated from a..vcnq-óvc orle Pow. Mg*.

111.200 Volt, 40 to 60 ode filament and "B' poser transformer. are Jin available for .ho model

©John F. Rider, Publisher or


16 LAFAYETTE MODEL B90(R)Early Voltage,Socket 'hrimmers,Coils

Resistances

LAFAYE'I"l'E RADIO MFG. CO.

C r

4i

)119 038

VOLTAGES AT SOCKETS Antenna Disconnected Battery 6 Volts Under Load

Type of

Tube Function Across

Heater Plate

to Ground

Screen to

Ground

Cathcde to

Ground

Cathode Current M. A.

6 3 6D6 R. F. Amp. 5.8 220

220

90 4 5

6C6 1st Det. Ose. 5.8 90 0 2.4

6D6 I. F. Amp. 5.8 220 90 4.5 6.3

75 2nd Det. 5.8 130(1) 1.2 0.3 2.-.. 41 Power 5.8 210 220 16(2)

84 Rectifier 5.8. 50.0

(1) With 250,000 Ohm Meter (2) As read across filter choke.

Fig. 3-R. F. and Oscillator Coil Base Terminal Arrangement and D. C. Resistance of Windings

D. C. Resistance of Windings

Following are the D. C. resistances of the various wind-

Part No. W Inding P -12A227 Dynamic Speaker

Output Transformer Primary Output Transformer Secondary Speaker Field Speaker Voice Coil

ings in the chassis. The values given below slightly in different sets.

will vary P -9A440 Oscillator Coils

Grid Coil Long Portion

D. C. Re- sistance Short Portion

Plate Coil Part No. Winding Code in Ohms

P -53X108 Power Transformer P -9A443 Antenna Transformer ...

Primary Winding Secondary Winding --Either Portion

TI 8.7 1.0

Primary Winding Censer Tap to Inside Center Tap to Outside

P -9A439 Interstage Transformer Primary Winding

T2 44.4

Secondary Winding Center Tap to Inside

Secondary Winding -Either Portion 1.4 Center Tap .to Outside P -9A441 1st I. F. Transformer

Primary Winding T3

93.5 P -9A444 P.9A448

Motor Noise Reactor Pilot Light fine Reactor

Secondary Winding 97.6 P 9A446 'Filament Reactor P-9.\442 2nd T. F. Transformer


T4 44.1 49.6

P -52X42 P -9A447 P -9A445

Filter Choke R. F. "B" Plate Reactor Vibrator Filter Reactor

D. C. Re- sistance

Cods In Ohms

T5 416.6 T5 Small L3 5.3

Small

T6

3.0 0.9 5.8

T7

Small Small

200. 200.

LI Small L2 Small I.4 Small 1.5 312.5 1.6 4.1 1.7 Small




rODEL B90(R)Early

I.AFrlY}+.'1"lT, RA1)1O 11 CO. Schor.tatic

Power Consumption - - 6.5 Amperes at 6.3 Volts Power Output - - - - 3 Watts Undistorted

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Tuning Frequency Range - - - - 530-1650 KC

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18 I.:1FAYr:TT)h. MODEL B90(N)Late Schematic ,Socket Tr immer s

Power Consumption

Power Output Sensitivity

LAFAI'E'1"l'E RADIO MFG. CO.

- 7.0 Amperes at 6.0 Volts 3 Watts Undistorted

1.0 Microvolt Absolute Selectivity - - 45 KC Broad at 1000 Times Signal

co,

07!/ J

- - - - 1 S I

I V in

~ l °ÓôOt@á31 re n o" 1,

V° I.

' e 1- ____ F. ------ \ u* e N

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11 1 1 _=m t,!

Tuning Frequency Range - - 530 to 1650 KC

Intermediate Frequency 175 KC

Speaker 6 inch Dynamic

07,U A1

---- MEW r af=J 1.

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I.AFAYh;'I" l'11; HAI)IO 1F(;<. CO. MODEL B90(N)Late Voltage,Alignment Coils,Resistances

ANTENNA R. E TRANS. INTERSTAGE LE TRANS.

Fig. 3-R. F. and Oscillator Coil Base Terminal Arrangement

D. C. Resistance of Windings Following are the D. C. resistances of the various windings in the chassis. The values given below will vary

slightly in different sets.

Code Winding TI Antenna Transformer

Primary Winding Long Portion Short Portion

Secondary Winding -Either Portion T2 Interstage Transformer


No. 1

No. 2

T3 1st I. F. Transformer Primary Winding 88.0 Secondary Winding 87.0

T4 2nd I. F. Transformer Primary Winding 43.0 Secondary Winding

VOLTAGES AT SOCKETS Antenna Disconnected Battery 6 Volts Under

I. F. Adjustment Set the signal generator for a signal of l'if KC.

Connect the antenna lead of the signal generator thru a .Of mf. condenser to the stator of the lu de -

Load te for section of the tuning condenser. (See Fig. 2

for location of this section.) This can be done by

Type of

Tube Function

Across Heater

Plate to

Ground

Screen to

Grouni

Cathode to

Ground

Cathode Current M. A.

6D6

6C6

6D6

75

41

84

R. F. Amp. 1st Det. Osc.

I. F. Amp. 2nd Det. Power Rectifier

5.6

5.6

5.6

5.8

5.8

5.8

245

245

245

120(1)

235

105 5.2

105 0

105 5.2

1.4

245 15.0(2)

7.5

2.9

7.5

0.14

30.0

52.0

(1) With 250,000 Ohm Meter (2) Read Across Filter Choke

Antenna

D. C. Re- sistance

in Ohms

OSC. COL

and D. C. Resistance of Windings

Cods Winding Dynamic Speaker

T5 Output Transformer Primary Secondary

L3 Speaker Field Speaker Voice Coil

T6 Oscillator Coils Grid Coil

Long Portion 5.1 Short Portion 3.2 Plate Coil 1.0 T7 Power Transformer

Primary Winding 415 Center Tap to Inside Small

Center Tap to Outside Small Secondary Winding

1.8 Center Tap to Inside 200.0 Center Tap to Outside 200.0

Ll Motor Noise Reactor Small IA Filament Reactor 22

L5 Filter Choke 300.0

L6 R. F. "B" Plate Reactor 4.0

48.2 L7 Vibrator Filter Reactor Small mmf. condenser to the antenna post of the signal generator. (If high capacity, use 1500 mmf.)

For this and all subsequent adjustments keep the volume control at the maximum position and attenuate the signal from the signal generator to prevent AVC action.

pushing a wire or conductor between the stator plates Adjust the trimmer of the oscillator section of the or by extending an insulated wire thru the hole it, three gang condenser until maximum output is ob -

the shield over the stator and pushing the wire theta tained-see Pig. 2 for location of this trimmer. the hole in the lug which extends up from the insu. 1400 KC Adjustment bated stator assembly. Set the signal generator for 1400 KC.

Connect the ground lead of the signal generator Turn the rotor of the tuning condenser carefully to the chassis ground. until maximum output is obtained.

Short out the oscillator section of the tuning condenser Adjust the 1st detector and antenna trimmers fix

Set the volume control at the maximum position. maximum output. Attenuate the signal from the signal generator to Do not change the setting of the oscillator trim

prevent the levelling off action of the AVC. mer.

Then adjust the three I.F. trimmers until maxi- Adjusting Antenna Trimmer mum output is obtained. The location of these trim- After the receiver is installed and the car antenna mers is shown in Fig. 2. is connected it will be necessary to adjust the antenna

1650 KC Adjustment trimmer. Tune in a weak signal between 1200 and

1 1400 KC with the volume control about three Set the signal generator for 1650 KC. fourths on. Remove the cover of the chassis case.

Turn the rotor of the tuning condenser to the full The antenna trimmer in on the center ranting conden. open position. sen section -ace Fg. 2. Twu the adjusting screw

of this condenser up or down until maximum output If a low capacity antenna is used connect the is obtained. CAUTION -Do not turn any of the

shielded antenna lead from the chassis through a 150 other trimmer adjusting screws for this adjustment.

D. C. Re- sistance

In Ohm.

IMPORTANT -If the car antenna is of high capacity (600 mmf. or higher) insert the antenna plug with the mark on the HC side -See Fig. 10.

If it is a low capacity antenna, insert the plug with the mark on the LC side.

The General Motors cars have steel roofs, and a running board or other under car antenna must be used. These are low capacity antennas. The Chrys- ler motor cars (except Plymouth) have a steel roof separated from the body proper, which is used as an antenna. These are high capacity antennas. Other cars without steel roofs such as Ford and Plymouth have a built-in roof antenna which is of low capacity.

416.6 Small

5.3 Small

2.9 0.9 5.e

If a running board or under -car antenna is used, it must be one which is covered with a suitable in- sulation, to prevent short circuiting in wet weather.

r^ -I PS G

HI CAPACITY

L-_ PAINT

MARK ON PLUG

Fig. I0 -Antenna Plug Insertion

©John F. Rider, Publisher www.americanradiohistory.com

20 LAFAYETTE

P:3DEL B92(K)Early Coils,Aligrnnent Schematic, Socket LAFAYh.rl'rl'E RADIO MFG. CO. Voltage,lrimmers

Adjusting Antenna 600 KC Trimmer After thetereceiver is installedece and the car the an-

te connected, it will be necessary to adjust the antenna trimmer. Tune in a weak signal at approá

VAINT mately 600 KC with the volume control about three - MA" ON R.W fourths on. Turn the adjusting screw of the antenna

f QrOQOQvt

600 KC trimmer up or down until maximum output is obtained. See Fig. 3 for location of this trimmer.

As shown in this illustration, the antenna plug u inserted in one of two ways, depending on whether the car has a high or low capacity antenna. Full in. structions are in the installation manual packed with each radio.

OJohn F. Rider, Publisher


a, 4.-----' · 2019-07-17 · lafayette page 10-1 n z a lafayette radio mfg. co. 3 band...

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